Is there any way to link together 2 time frame nodes in with animation nodes?
In the Time submenu you also have some Animate ... nodes for vector, euler etc.
You should use them for animating between a frame and another.

Note that:


they also have a Time output so that you can use several in a series 
they have an interpolation method. There is a whole interpolation submenu for having a lot of control over that, if the default set of options is not enough.




ps:
For complex situations or for many objects or instances of an object, if more than several animate nodes would be used, use subprograms, loops especially for lists of objects, having animate nodes triggered by various rules.